I wouldnn't UNLESS:

• Both children can swm (not just dog paddle) and have the endurance to do so for an extended period without being able to touch bottom
• There would be 2 adults - one to tend each of the children at all times
• Neither child is the overly fearful or overly agressive type in the presence of' creatures they are encountring for the first time, and which may seem very strange to them
• Both children can be absolutely and reliably counted on to respond to instructions by following them immediately and completely without question or the need to be cajoled

Note from the RCL website on the depth of the water:

This tour is in relatively shallow water (usually 3-7 feet), but the depth can change depending on the tides. Note: Guests 16 and under must be accompanied by an adult

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